1. If they had laid out a 5(?) year low volume production plan of engine casing, how likely do you think that they have not flight test the "prototype"?
2. Let's not go into a word of play. Be moderate and cautious is all that is needed, no need to jump from overly confident of something to the other extreme side of nothing and anything.
Like they say Rome is not built in the day. Expecting China to be on the same level as the west when it come to Jet engine is just plain ridiculous and delusional. Forgetting that 20 years ago air travel in China does not exist. Just getting by with food and keep the body warm is a struggle let alone travelling by Air.
Air travel and civilian jet engine self sufficiently is a luxury that can wait. For the masses China can get by using HSR to travel inside the country and she is independent when it come to designing, producing, constructing world class HSR.
But China is now independent when it come to military jet engine production that is something more important and worthy of celebration!